Bit9 on Thursday announced it has merged with another cybersecurity firm, Texas-based Carbon Black, and raised $38.25 million in new funding to fuel the growth of the combined company, which will keep the Bit9 name.

Terms of the merger deal weren't disclosed.

Bit9, a Waltham, Mass.-based security software firm, said the Carbon Black technology is complementary to its own, and together the two firms will "bring enterprise customers a level of security they cannot get from any other vendor."

The new funding was led by existing investor Atlas Venture and included all other current Bit9 investors — .406 Ventures, Highland Capital Partners, Kleiner Perkins Caufield & Byers and Sequoia Capital. The round also included a direct investment by Blackstone, an investor in Carbon Black. Bit9 has now raised a total of $120 million since its founding in 2002.

Bit9 employs 200 on its own, with 120 of those in Waltham, a spokeswoman said; the number of employees Carbon Black will add was not immediately available.

Bit9 has previously described its approach as providing trust-based security — which only allows trusted software to run on customers' computers — as opposed to the traditional blacklisting strategy of banning certain software.

Carbon Black, meanwhile, aims to provide organizations with incident response to data breaches in seconds, saving them from having to pay outside consultants.

"The combination of Bit9 and Carbon Black leapfrogs the rest of the market, as we are the only company that empowers security teams to immediately prevent, detect and respond to advanced attacks on their endpoints and servers," Bit9 CEO Patrick Morley said in a news release.

Carbon Black CEO Mike Viscuso will take the new position of chief strategy officer at Bit9, reporting to Morley.

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